Combined injector nozzle and filter



July 13, 1948. J, F, HQFr-ER 2,445,269

A` COMBINED INJEcTon NozzLE AND-Hmm original Filed karen 1, 19:59

Patented July 1'3, 194s COMBINED INJECTOB NOZZLE AND FILTER James F.nouer, Detroit, Mien., minor to Ex Cell- Corporation, Detroit, Mich.,acorporation of Michigan oriana! application Marsh 1, use, serial No.

259,088. Divided and this application May 6, 1944,- sernl No. 534,440

The present invention relates to improvements in nozzles adaptedparticularly for delivering timed metered injections of liquid fuel inconnection-with the operation of internal combustion engines.

One of the objects of the invention is to pmvide a new and improved fuelinjection nomic having a safety oli filter located in proximity to thenozzle tip.

Another object is to provide a novel fuel injection nozzle having aholder which encloses a safety oil filter in the path of the. fuel flowto the nozzle tip and in which the filter is secured in position withoutthe `use of threads or gasket connections v directly with the tip.

4 Chilnl. (Cl. ZIO-134) with a central opening or bore il terminating jWhile the invention is susceptible of various modifications andalternative constructions, vI

. have shown in the drawings and will herein decharge end with an endwail l having a small discharge bore t coaxial with the bore 4.- An

external peripheral mounting flange 1 is formed on the base end of thebody I.

Closely fitted within the bore 4 is a valve scat member I having aninner end surface l in pressure tight engagement with the inner surfaceIl of the end wall I about the bore 6. yThe valve seat member I istubular in form to provide an axial passage or bore Il, and projectsfrom the open end ofthe tip body 2 for fluid tight connection to thesource of fuel supply. The inner end of the seat member l has an endwalli2 formed in an annular valve seat il.

A pintle i5v extends slidably through the disf charge bore i and coactsv therewith to define a discharge orifice means having suitable fueldischarge characteristics for proper atomization and penetration. Thepintle i5 consists of a cylindrical stem which is formed adjacent itsouter end portion with a spray control form consisting ofl a narrowcylindrical area It of full pintle diameter, a control cone i1 taperinginwardly from the area il, and an outer cone il able in a counterbore orchamber 2| in the inner end of the bore-6 is a peripheral rib 22. Therib 22 defines a conical abutment shoulder 23 adapted for engagementwith a fixed conical stop shoulder 24 at the end of the counterbore 2ito limit Referring more particularly to the drawings,

one form of fuel injection nozzle embodying features of the presentinvention (Fig. 1) comprises a replaceable nozzle unit or tip iremovably mounted in a holder 2. It will be .understood that v ,l thenozzle tip i is adapted to be clamped or secured by ymeans of the holder2 to the engine (not shown) at the desired point of injection.

The nozzle tip i may be of any suitable character and in the presentinstance of the .type

' disclosed in my copending application Serial No.

the opening movement of the pintle il.

' A free path of fuel flow from the valve il, 2l

`fuel issuing from the passages 2t.

A coil compression spring 21 is mounted within the seat member l and atone end impinges against the inner surface of the wall i2, and iscentered bythe end of the bore il which is reduced inv diameterasindicated atv 2l. vAt the other end, the spring 21 impinges against ahanger 2l slidably disposed in the bore ii and suitably anchored to thepintle II. In the preferred form,

the pintie I9 is provided with an elongated shank Il having an enlargedhead 3i at its free inner end. The hanger consists of a circular diskhaving an axially offset portion which serves to center the adjacent endof the spring 21, and which defines an outwardly opening socket 32having a central opening 89 to receive the shank 3l. The opening 39 islarger than the shank il to provide clearance permitting limited angularadjustment of the hanger 29 to the end plane of the spring 21. Aclearance hole I4 of sufficient size to receive the head 3l intersectsone side of the opening 33 to permit assembly of the hanger 29 and theshank 30. When the parts are assembled as shown, the socket 32 is inpilot engagement with an abutment shoulder 35 on the.-

base of the head 3|. A plurality of peripherally spaced notches 3i areformed in the hanger disk 29 and supplement the opening 33 to provide anadequate area for unrestricted fuel flow past the hanger.

The holder 2 is adapted to support the nozzle tip l in operativeposition to inject fuel into a combustion lchamber (not shown), and toconnect the tip to a fuel supply line leading from a suitable fuelsource. In the form shown. the holder 2 comprises an outer body orhousing 31 which preferably consists of an elongated generally tubularshell having a longitudinal bore Il and an external peripheral hexagonalmounting flange 39. One end of the body 31 is formed with an innerperipheral flange 40 for holding the nozzle tip I and has an end surface4I adapted to be clamped through a vgasket (not shown) against a matingsurface (not shown) in the engine cylinder head (not shown) to provide agastight seal. A clamp plate 42 closely encircles the outer end of thebody 31fand engages the outer end of the 'mounting flange 39. The plate42 is formed at oppositesides of the body I1 with suitable holes 4'3through which bolts (not shown) may be inserted to clamp the holder 2 inposition.

The mounting flange 1 of the nozzle tip I is positioned against thevinner surface 44 of the flange 40, a suitable gasket 45`belng interposedtherebetween, and the tip projects through the fiange 40 to extend intothe combustion chamber of the engine. Removably inserted into the holderbody 91 is a cylindrical filter holder 49 having an axial stem 41 on oneend extending into the inner end of the bore II of the valve seat memberl, and having an axial bore or passage 4l opening therethrough. Theinlet end of the bore 49 is formed with two counterbores 49 and SII inwhich a fuel filter I is removably mounted. The fllter holder 46 isformed on one end at the base of the stem 41 with aconical abutment 62adapted for fluid-tight engagement with an annular mating surface 53 onthe inner-end of the valve seat B coaxial with the bore II. A nut I4,with an outer hexagonal head 55 and an axial bore 56 openingtherethrough, is threaded into the outer end of the bore 39 of theholder body 31, and is formed on the inner endvwith a coaxial conicalabutment surface 51 in fluid-tight engagement with a mating surface 5lon the filter holder 46. It will be seen that when the nut 54 istightened, it will clamp the nozzle tip I and the filter holder 4`6securely in position within the holder 2 while maintaining communicationbetween the alined bores II, 49 and 59.

High pressure tubing from a fuel injection pump or other fuel source maybe suitably connected to the outer end of the nut 54. In the presentinstance. ahollow fitting 59 is removably clamped with a pressure-tightseal against the outer end of the nut 54 by a bolt 99 threaded into theouter end of the bore 59. The fitting Il loosely encircles the shank ofthe bolt 4l. and has a laterally extending threaded nipple 0I adapted tobe connected to the tubing. The outer end of the nut 54 and the head ofthe bolt 40 are formed with opposed coaxial conical abutment surfaces 92and 93 adapted for pressure-tight engagement with mating surfaces 94 and6l in opposite sides of the fitting 59. It will be seen that when thebolt 80 is tightened, the fitting Il will b'e clamped securely inposition. The bolt 60 is formed with an axial bore 49 which opens to thecounterbore 50, and which is connected through a plurality ofintersecting radial ports 91 in the shank of the bolt to the interior ofthe fitting 69.

The filter 5I may be of any suitable character, and preferably is of thedisk type. In the form shown. the filter 5I comprises a cylindrical body68 with a seal ring 99 fitted tightly within the counterbore 49. Aplurality of filtering disks 1I are clamped in coaxial relation to thebody Il within and in4 peripherally spaced relation to the counterbore50. v

In operation, fuel supplied from the source passes through the fitting59, the ports 61. the bore 66, the filter 5I and the bore 49 to thenozzle tip I. The holder 2 permits the filter 5I to be installed withoutremoving the nozzle tip I from the engine. Being mounted directly in thenozzle holder 2, the filter 5I is located close to the tip I, andrequires no threaded connections.

I claim as my invention:

1. A fuel injection nozzle comprising, in combination, a holder havingan external cylindrical casing formed in one end with an internalperipheral flange, a nozzle tip removably mounted in said one end ofsaid casing and having an external peripheral flange engaging said firstmentioned flange and having an axial inlet bore, a cylindrical filterholder removably inserted in said casing and having an axial steminserted in said bore, said holder being formed with an axial passageopening therethrough and communicating at the discharge end with saidbore and formed with an enlarged stepped counterbore in the inlet end ofsaid passage, a nut threaded into the other end of said casing ,andserving to clamp said casing, nozzle tip and filter holder rigidly inlassembled relation and formed with an inlet passage opening to saidcounterbore and adapted to be connected to a source of fuel, and afilter removably inserted in said counterbore.

2. A fuel injection nozzle for internal combustion engines comprising,in combination, a holder having anexternal elongated casing formed inone end with an internal flange, a nozzle tlp removably mounted in andprojecting from said one end of said casing and having an externalperipheral flange engaging said first mentioned flange and an inletbore. a cylindrical filter holder removably inserted in said casing andformed with an axial passage opening therethrough and communicating withsaid bore and with an enlarged counterbore in the inlet end of saidpassage, said inlet end of said passage being adapted to receive fuelfrom a fuel source. a nut threaded to said casing and serving to clampsaid casing, nozzle tip and filter holder rigidly in assembled relation.and a filter removably inserted in said counterbore.

3. A fuel injection nozzle for internal combustion engines comprising,in combination, a

holder having an external elongated casingfa nozzle tip slidably mountedin and projecting from one end of said casing and having a fuel inlet, afilter holder slidably inserted in said casing in separable end to endfluid-tight engagement with said tip and formed with a longitudinalpassage opening therethrough and enlarged at one end and communicatingwith said inlet, means threaded into the other end of said casing intoend to end 'fluid-tight engagement with said iilter holder serving toclamp said casing, nozzle tip and filter holder rigidly in assembledrelation, and a iilter removably inserted in said enlarged end of saidpassage.

4; A fuel injection nozzle for internal combustion engines comprising,in combination, a holder having an external elongated casing, a nozzletip slidably mounted in and projecting from one end of said casing andhaving a fuel inlet, ,a iilter holder slidably inserted in said casinginseparable end to lend engagement with4 REFERENCES CITED The followingreferences are of recordin the le of this patent:

UNITED STATES PATENTS 15 Number Name Date 247,151 Beggs Sept. 20, 18811,835,047 H111 Dec. 8, 1931 2,062,362 Hubbard Dec. 1, ,1936 2,068,837-Aronson Jan. 26, 1937 n 2,134,413 Munoz Oct. 25. 193i! Hoffer July 28,1942

